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Radiation monitoring in the residential environment; Time dependencies of air dose rate and $$^{137}$$Cs inventory

市街地における空間線量率、セシウム-137沈着量の経時変化

吉村 和也  ; 中間 茂雄 ; 藤原 健壮 

Yoshimura, Kazuya; Nakama, Shigeo; Fujiwara, Kenso

To better understand the radiation environment in urban area, this study investigated temporal changes in air dose rate as well as $$^{137}$$Cs inventories (Bq m$$^{-2}$$) in both residential areas and agricultural fields. The air dose rate decreased faster in residential areas than in agricultural fields. It was also observed that the $$^{137}$$Cs inventory on paved surfaces decreased with time due to horizontal wash-off, while the permeable surfaces showed no significant temporal changes unless decontamination. Our results suggest that the horizontal wash-off of $$^{137}$$Cs on the paved surfaces facilitated the decrease in air dose rate in urban areas to a greater extent compared with agricultural fields, of which air dose rate was decreased due to vertical migration of $$^{137}$$Cs.

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